Minor update to Neo4j readme.
Minor update to Neo4j readme.

"Neo4j" is the correct case - see neo4j.com
IHTSDO/snomed-database-loader,rorydavidson/SNOMED-CT-Database,IHTSDO/snomed-database-loader,rorydavidson/SNOMED-CT-Database,IHTSDO/snomed-database-loader,rorydavidson/SNOMED-CT-Database